Film-indicating shutter device for cameras



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Ham Len 0PM INVENTQR.

A TTORNE Y5 lll - wall riser oh WS LEPPERHOFF, 0F READING, PENNSYLVANIA.

FILM-INDICATING SHUTTER DEVICE FUR CAMERAS.

Application filed March 21, 1925. Serial No. 17,277.

To all whom it may concern:

Beit known that l, HANs Lnrrnnrrorr, a citizen or the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Film-Indicating Shutter Devices for Cameras, of which the following is a specification.

This invention relates to shutter-operating mechanism for cameras, in which provision is made for automatically showing the rotation of the film so as to prevent double exposures; and it provides for determinedly rotating an indicator wheel at each reciprocation of the shutter plunger in an improved and simple structure fully described in connection V with the accompanying drawings and the novel features of which are clearly defined in the subjoined claims.

Fig. 1 is a much enlarged sectional view of a complete device embodying my invention in preferred form.

Fig. 2 is a cross-sectional view on the line 2*2 of Fig. 1. r

Fig. 3 is a separate view of the cylindrical ortion of the indicator wheel developed into a fiat sheet-metal stamping such as is preferably employed; the engaging projections upon the enclosing casing, and a dotted-line position of the indicator, being also shown so as to make clear diagrammatically the intermittent turning action imparted to the completed wheel by reciprocat1on of the connected plunger.

Fig. 4 is a plan view of the separately formed diametrally arranged plunger contion.

' flexible rod 6 hy wl" ch nection of the indicator wheel as illustrated in Fig. 1. i

Fig. 5 indicates a me which the indicator 7 stitute a unitary Shilllbt ing of the reciprooated wheel but essentially einhodyi 'ied construction in .ndplunger connvolvni turnt th the my invenicetes the usual shutter rew i h it is The drawing partly leased, the usua 3 moved-being o date this rod is q to engagement with the inserted lower portion ill of the plunger stem 10 so as to partake of the reciprocating vertical movement of the'latter.

' As shown in the preferred construction illustrated the angular-sectioned plunger 10 is non-rotatively guided in the centrally apertured-ca'p 11 of the cylindrical casing 12; and in addition to operating the flexible shutter-rod 6 as stated carrieswith it in its l'eciprocative movement an independently rotatable indicator wheel the periphery of which is provided with a circular series or" numbers or indiccs adapted to be successively shown through an exposing aperture 12 in the casing wall 12. The cylindrical wall portion 15 of this indicator wheel is preferably formed by a folded-up sheetmetal stamping such as shown in Fig. this being suitably secured to a centrally apertured diametral hub portion 15 whereby the complete wheel is loosely mounted upon the plunger extension 10 so as to per unit or its being independently rotated while partaking of the reciprocative movement of xthe plunger.

To provide for imparting determined rotary movements to the re'ciprocated indi-.

cator wheel 15, I employan adaptation of the crown-wheel-escapement movement, as indicated; both'the upper and lower circular edge portions of the cylindrical indicator wall being formed with Vrshaped cogs, 15

15 respectively, which successively engage inward projections 12 and l2 on the casing well adapted to serve as fixed pallets; the axial movements of the indicator wheel with the plunger causing rotation thereof as determinedby' contact of the inclines of the upper and lower cogs successively with thedownward movement thereof releasing the shutter for exposing film 6, causing the incline 7 of a lower cog 15.to contact with a lower pro ection 12', and rotate the wheel sufiiciently to make its succeeding upward movement result in completing the turning movement so as to expose the succeeding film number {7), through the casing aperture 12 It will he noted thatthe projections 12 and 153 are arranged out of vertical alineinent so as to insure their proper relation to the inclined cogs successively enigaged'; and that each reciprocation oi the plunger and wheel causes a rotary advance of the latter so as to indicate the number of the film to be next used.

sis

Thus each downward and upward movement of the plunger merely carries the indicator wheel vcrtically, its turning movement being efi'ected entirely by its contact with the fixed projections on the casing.

As specifically set forth this turning movement of the indicator wheel is not only 1. Ina shutter device for cameras comprising a shutter-rod plungcr;'a cylindrical casing having a number-exposing wall aperture and inwardlyrxtendlng wall 'p r0]ections above and below said aperture, and an indicator wheel carried by said plunger; said. indicator wheel having oppositely extending cogs adapted to successively engage said upper-and lower wall projections so asto impart a determined rotary movement to the wheel at each reciprocation of the plunger. I I v g 2. In a shutterdevicej for cameras comprising a shutter-rod plunger; a cylindrical casing havinga number-exposing wall aper- 'ture and inwardly extending wall projections above and below said aperture, and an indicator'wheel carried by and freely rotatable; upon. said plunger; said indicator wheel having oppositely extending cogs adapted to successively engagesaid upper and lower wall projections so as' to im art a. determined rotary movement to the w eel at each reciprocation of the plunger.

3. Ina shutter device fon cameras comprising a shutter-rod plunger; a cylindrical casing having a number-exposing wall aperture, an indicator wheel carried by said plunger, and wheel-engaging means fixed to said casing whereby a determined rotary movement is imparted to .thcwheel during each reciprocatory movement of the plunger.

4:. In a shutter device for cameras comprising ashutter-rod plunger; a cylindrical casing having a number-exposing Wall aperture, an'indicator wheel carried by and freely, rotatable upon said plunger,- and wheel-engagingmeans fixed to said casing whereby a determined rotary movement is imparted to the wheel during each-reciprocatory movement of the plunger.

- 5. In a shutter device for cameras comprising a cylindrical casing having a numbenexposing wall aperture, and a shutter-rod plunger; a rotatable indicator-wheel in said casing carried by said plunger and comprising a cylindrical indicator-wall portion separately. formed of stamped .sheet material and a diametral plunger-connecting portion.

6. In a shutter device for cameras comprising a cylindrical casing having a number-exposing wall aperture, and a shutter-rod plunger; a rotatable indicator wheel in said casing comprising a cylindrical indicator-wall portion separately formed of stamped sheetmaterial; and an attached diametral plate rotatably mounted upon said plunger.

In testimony whereof I aflix m signature.

HANS LEPPEIEHOFF. 

